Quote:
Originally posted by scoochv
What does the resonator exactly do? Is there a weight difference b/w that and a srtaight pipe? I'm thinking about exchanging mine with a straight pipe now, too...
-scooch
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Hi Scooch.
The effect, of removing the resonator and useing a straight pipe, would be a tapering off, of the torque curve after about 4500. That top end rush that gets us overtaking quickly and safely would be lacking somewhat around 5500 to 6500. This is because of the pressure rise in the header pipe, acting back into the cylinder to foul the inlet charge when the valve opens,
Not having the resonator in place means that the exhaust pressure plug has to travel down to the rear muffler to expand, so the ambient pressure at the exhaust ports will rise earlier in the rev range than it was designed to. Of course the amount that you notice the loss, depends on how much time you spend on the razors edge.
The best fix for a resonator rattle, is to replace it with another one, the same as you would do with any other part that was faulty.
It does not have to be a Subaru replacement, any resonator or glass packed that will fit, is better than nothing, the bigger the volume the better.
This is a bit involved but it's probably why it's function is so misunderstood
Harvey.